SlideShare a Scribd company logo
Explain why it is a concern that people rely on relatively few species of plant and animal for
food and how this violates the principle of sustainability. Describe at least one specific example
of how something could occur that would cause a problem.
What can individuals do to shift to more sustainable energy use?
What is the difference between net energy and net energy ratio?

More Related Content

More from azerotothree

Figure 1- Administrative map of 31 province-level regions in ChinaTabl.pdf
Figure 1- Administrative map of 31 province-level regions in ChinaTabl.pdfFigure 1- Administrative map of 31 province-level regions in ChinaTabl.pdf
Figure 1- Administrative map of 31 province-level regions in ChinaTabl.pdf
azerotothree
ย 
Fill in the blanks with the correct terms related to the development d.pdf
Fill in the blanks with the correct terms related to the development d.pdfFill in the blanks with the correct terms related to the development d.pdf
Fill in the blanks with the correct terms related to the development d.pdf
azerotothree
ย 
Fill in the Blanks Answers typed in all of the blanks will be automati (1).pdf
Fill in the Blanks Answers typed in all of the blanks will be automati (1).pdfFill in the Blanks Answers typed in all of the blanks will be automati (1).pdf
Fill in the Blanks Answers typed in all of the blanks will be automati (1).pdf
azerotothree
ย 
Figure 6-1 displays how innovation fades with distance and time- and F.pdf
Figure 6-1 displays how innovation fades with distance and time- and F.pdfFigure 6-1 displays how innovation fades with distance and time- and F.pdf
Figure 6-1 displays how innovation fades with distance and time- and F.pdf
azerotothree
ย 
Fill in the blank below- A researcher wants to show the mean from popu (1).pdf
Fill in the blank below- A researcher wants to show the mean from popu (1).pdfFill in the blank below- A researcher wants to show the mean from popu (1).pdf
Fill in the blank below- A researcher wants to show the mean from popu (1).pdf
azerotothree
ย 
FIgure legend from the paper- Three-dimensional segmented surface mode.pdf
FIgure legend from the paper- Three-dimensional segmented surface mode.pdfFIgure legend from the paper- Three-dimensional segmented surface mode.pdf
FIgure legend from the paper- Three-dimensional segmented surface mode.pdf
azerotothree
ย 
Fill in the blank- Analysis of Variance Source DF Adj SS Adj M.pdf
Fill in the blank-   Analysis of Variance   Source   DF  Adj SS  Adj M.pdfFill in the blank-   Analysis of Variance   Source   DF  Adj SS  Adj M.pdf
Fill in the blank- Analysis of Variance Source DF Adj SS Adj M.pdf
azerotothree
ย 
Figure 9-28 shows that in India and much of eastern China- naturally o (1).pdf
Figure 9-28 shows that in India and much of eastern China- naturally o (1).pdfFigure 9-28 shows that in India and much of eastern China- naturally o (1).pdf
Figure 9-28 shows that in India and much of eastern China- naturally o (1).pdf
azerotothree
ย 
Figure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdf
Figure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdfFigure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdf
Figure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdf
azerotothree
ย 
Fil in the P(X-x) values to give a legtinate probabiity distribution f.pdf
Fil in the P(X-x) values to give a legtinate probabiity distribution f.pdfFil in the P(X-x) values to give a legtinate probabiity distribution f.pdf
Fil in the P(X-x) values to give a legtinate probabiity distribution f.pdf
azerotothree
ย 
Figure 4 shows the internal optics of a modified reflector- called a C.pdf
Figure 4 shows the internal optics of a modified reflector- called a C.pdfFigure 4 shows the internal optics of a modified reflector- called a C.pdf
Figure 4 shows the internal optics of a modified reflector- called a C.pdf
azerotothree
ย 
Figure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdf
Figure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdfFigure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdf
Figure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdf
azerotothree
ย 
Figure 15- - Construct isobars on the map using 4-0mb interval beginni.pdf
Figure 15- - Construct isobars on the map using 4-0mb interval beginni.pdfFigure 15- - Construct isobars on the map using 4-0mb interval beginni.pdf
Figure 15- - Construct isobars on the map using 4-0mb interval beginni.pdf
azerotothree
ย 
Figure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdf
Figure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdfFigure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdf
Figure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdf
azerotothree
ย 
Fact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdf
Fact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdfFact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdf
Fact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdf
azerotothree
ย 
Factor that upon increasing leads to increase in another factor of pro.pdf
Factor that upon increasing leads to increase in another factor of pro.pdfFactor that upon increasing leads to increase in another factor of pro.pdf
Factor that upon increasing leads to increase in another factor of pro.pdf
azerotothree
ย 
Ficld Propertics General Lookup Field Size Long Integer -begin{tabular.pdf
Ficld Propertics General Lookup Field Size Long Integer -begin{tabular.pdfFicld Propertics General Lookup Field Size Long Integer -begin{tabular.pdf
Ficld Propertics General Lookup Field Size Long Integer -begin{tabular.pdf
azerotothree
ย 
Fetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdf
Fetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdfFetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdf
Fetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdf
azerotothree
ย 
F ducational Television in a randons sample of 210 people- 146 said th.pdf
F ducational Television in a randons sample of 210 people- 146 said th.pdfF ducational Television in a randons sample of 210 people- 146 said th.pdf
F ducational Television in a randons sample of 210 people- 146 said th.pdf
azerotothree
ย 
Feedback is seen in protein digestion- where the presence of partially.pdf
Feedback is seen in protein digestion- where the presence of partially.pdfFeedback is seen in protein digestion- where the presence of partially.pdf
Feedback is seen in protein digestion- where the presence of partially.pdf
azerotothree
ย 

More from azerotothree (20)

Figure 1- Administrative map of 31 province-level regions in ChinaTabl.pdf
Figure 1- Administrative map of 31 province-level regions in ChinaTabl.pdfFigure 1- Administrative map of 31 province-level regions in ChinaTabl.pdf
Figure 1- Administrative map of 31 province-level regions in ChinaTabl.pdf
ย 
Fill in the blanks with the correct terms related to the development d.pdf
Fill in the blanks with the correct terms related to the development d.pdfFill in the blanks with the correct terms related to the development d.pdf
Fill in the blanks with the correct terms related to the development d.pdf
ย 
Fill in the Blanks Answers typed in all of the blanks will be automati (1).pdf
Fill in the Blanks Answers typed in all of the blanks will be automati (1).pdfFill in the Blanks Answers typed in all of the blanks will be automati (1).pdf
Fill in the Blanks Answers typed in all of the blanks will be automati (1).pdf
ย 
Figure 6-1 displays how innovation fades with distance and time- and F.pdf
Figure 6-1 displays how innovation fades with distance and time- and F.pdfFigure 6-1 displays how innovation fades with distance and time- and F.pdf
Figure 6-1 displays how innovation fades with distance and time- and F.pdf
ย 
Fill in the blank below- A researcher wants to show the mean from popu (1).pdf
Fill in the blank below- A researcher wants to show the mean from popu (1).pdfFill in the blank below- A researcher wants to show the mean from popu (1).pdf
Fill in the blank below- A researcher wants to show the mean from popu (1).pdf
ย 
FIgure legend from the paper- Three-dimensional segmented surface mode.pdf
FIgure legend from the paper- Three-dimensional segmented surface mode.pdfFIgure legend from the paper- Three-dimensional segmented surface mode.pdf
FIgure legend from the paper- Three-dimensional segmented surface mode.pdf
ย 
Fill in the blank- Analysis of Variance Source DF Adj SS Adj M.pdf
Fill in the blank-   Analysis of Variance   Source   DF  Adj SS  Adj M.pdfFill in the blank-   Analysis of Variance   Source   DF  Adj SS  Adj M.pdf
Fill in the blank- Analysis of Variance Source DF Adj SS Adj M.pdf
ย 
Figure 9-28 shows that in India and much of eastern China- naturally o (1).pdf
Figure 9-28 shows that in India and much of eastern China- naturally o (1).pdfFigure 9-28 shows that in India and much of eastern China- naturally o (1).pdf
Figure 9-28 shows that in India and much of eastern China- naturally o (1).pdf
ย 
Figure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdf
Figure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdfFigure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdf
Figure 8-1 Refer to Figure 8-1- Suppose the government imposes a tax o.pdf
ย 
Fil in the P(X-x) values to give a legtinate probabiity distribution f.pdf
Fil in the P(X-x) values to give a legtinate probabiity distribution f.pdfFil in the P(X-x) values to give a legtinate probabiity distribution f.pdf
Fil in the P(X-x) values to give a legtinate probabiity distribution f.pdf
ย 
Figure 4 shows the internal optics of a modified reflector- called a C.pdf
Figure 4 shows the internal optics of a modified reflector- called a C.pdfFigure 4 shows the internal optics of a modified reflector- called a C.pdf
Figure 4 shows the internal optics of a modified reflector- called a C.pdf
ย 
Figure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdf
Figure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdfFigure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdf
Figure 2 Assembled Stratigraphic Model 1Quetion 1 Whiv ie eersective i.pdf
ย 
Figure 15- - Construct isobars on the map using 4-0mb interval beginni.pdf
Figure 15- - Construct isobars on the map using 4-0mb interval beginni.pdfFigure 15- - Construct isobars on the map using 4-0mb interval beginni.pdf
Figure 15- - Construct isobars on the map using 4-0mb interval beginni.pdf
ย 
Figure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdf
Figure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdfFigure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdf
Figure 16-12- Arteres-Figure 16-13- Inferior mesenteric a- Superior me.pdf
ย 
Fact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdf
Fact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdfFact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdf
Fact 1 Water (H2O) is a polar inorganic compound that is at room tempe.pdf
ย 
Factor that upon increasing leads to increase in another factor of pro.pdf
Factor that upon increasing leads to increase in another factor of pro.pdfFactor that upon increasing leads to increase in another factor of pro.pdf
Factor that upon increasing leads to increase in another factor of pro.pdf
ย 
Ficld Propertics General Lookup Field Size Long Integer -begin{tabular.pdf
Ficld Propertics General Lookup Field Size Long Integer -begin{tabular.pdfFicld Propertics General Lookup Field Size Long Integer -begin{tabular.pdf
Ficld Propertics General Lookup Field Size Long Integer -begin{tabular.pdf
ย 
Fetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdf
Fetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdfFetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdf
Fetuin en- Livestment (Bast) h M lexidual Inicome 10c Framions IIf 21c.pdf
ย 
F ducational Television in a randons sample of 210 people- 146 said th.pdf
F ducational Television in a randons sample of 210 people- 146 said th.pdfF ducational Television in a randons sample of 210 people- 146 said th.pdf
F ducational Television in a randons sample of 210 people- 146 said th.pdf
ย 
Feedback is seen in protein digestion- where the presence of partially.pdf
Feedback is seen in protein digestion- where the presence of partially.pdfFeedback is seen in protein digestion- where the presence of partially.pdf
Feedback is seen in protein digestion- where the presence of partially.pdf
ย 

Recently uploaded

How to Manage Reception Report in Odoo 17
How to Manage Reception Report in Odoo 17How to Manage Reception Report in Odoo 17
How to Manage Reception Report in Odoo 17
Celine George
ย 
Bossa Nโ€™ Roll Records by Ismael Vazquez.
Bossa Nโ€™ Roll Records by Ismael Vazquez.Bossa Nโ€™ Roll Records by Ismael Vazquez.
Bossa Nโ€™ Roll Records by Ismael Vazquez.
IsmaelVazquez38
ย 
Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...
Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...
Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...
ImMuslim
ย 
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptxRESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
zuzanka
ย 
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...
EduSkills OECD
ย 
spot a liar (Haiqa 146).pptx Technical writhing and presentation skills
spot a liar (Haiqa 146).pptx Technical writhing and presentation skillsspot a liar (Haiqa 146).pptx Technical writhing and presentation skills
spot a liar (Haiqa 146).pptx Technical writhing and presentation skills
haiqairshad
ย 
HYPERTENSION - SLIDE SHARE PRESENTATION.
HYPERTENSION - SLIDE SHARE PRESENTATION.HYPERTENSION - SLIDE SHARE PRESENTATION.
HYPERTENSION - SLIDE SHARE PRESENTATION.
deepaannamalai16
ย 
CIS 4200-02 Group 1 Final Project Report (1).pdf
CIS 4200-02 Group 1 Final Project Report (1).pdfCIS 4200-02 Group 1 Final Project Report (1).pdf
CIS 4200-02 Group 1 Final Project Report (1).pdf
blueshagoo1
ย 
A Free 200-Page eBook ~ Brain and Mind Exercise.pptx
A Free 200-Page eBook ~ Brain and Mind Exercise.pptxA Free 200-Page eBook ~ Brain and Mind Exercise.pptx
A Free 200-Page eBook ~ Brain and Mind Exercise.pptx
OH TEIK BIN
ย 
Electric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger HuntElectric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger Hunt
RamseyBerglund
ย 
220711130088 Sumi Basak Virtual University EPC 3.pptx
220711130088 Sumi Basak Virtual University EPC 3.pptx220711130088 Sumi Basak Virtual University EPC 3.pptx
220711130088 Sumi Basak Virtual University EPC 3.pptx
Kalna College
ย 
How to Fix [Errno 98] address already in use
How to Fix [Errno 98] address already in useHow to Fix [Errno 98] address already in use
How to Fix [Errno 98] address already in use
Celine George
ย 
Oliver Asks for More by Charles Dickens (9)
Oliver Asks for More by Charles Dickens (9)Oliver Asks for More by Charles Dickens (9)
Oliver Asks for More by Charles Dickens (9)
nitinpv4ai
ย 
skeleton System.pdf (skeleton system wow)
skeleton System.pdf (skeleton system wow)skeleton System.pdf (skeleton system wow)
skeleton System.pdf (skeleton system wow)
Mohammad Al-Dhahabi
ย 
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...
TechSoup
ย 
Standardized tool for Intelligence test.
Standardized tool for Intelligence test.Standardized tool for Intelligence test.
Standardized tool for Intelligence test.
deepaannamalai16
ย 
Skimbleshanks-The-Railway-Cat by T S Eliot
Skimbleshanks-The-Railway-Cat by T S EliotSkimbleshanks-The-Railway-Cat by T S Eliot
Skimbleshanks-The-Railway-Cat by T S Eliot
nitinpv4ai
ย 
Temple of Asclepius in Thrace. Excavation results
Temple of Asclepius in Thrace. Excavation resultsTemple of Asclepius in Thrace. Excavation results
Temple of Asclepius in Thrace. Excavation results
Krassimira Luka
ย 
REASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdf
REASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdfREASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdf
REASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdf
giancarloi8888
ย 
Accounting for Restricted Grants When and How To Record Properly
Accounting for Restricted Grants  When and How To Record ProperlyAccounting for Restricted Grants  When and How To Record Properly
Accounting for Restricted Grants When and How To Record Properly
TechSoup
ย 

Recently uploaded (20)

How to Manage Reception Report in Odoo 17
How to Manage Reception Report in Odoo 17How to Manage Reception Report in Odoo 17
How to Manage Reception Report in Odoo 17
ย 
Bossa Nโ€™ Roll Records by Ismael Vazquez.
Bossa Nโ€™ Roll Records by Ismael Vazquez.Bossa Nโ€™ Roll Records by Ismael Vazquez.
Bossa Nโ€™ Roll Records by Ismael Vazquez.
ย 
Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...
Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...
Geography as a Discipline Chapter 1 __ Class 11 Geography NCERT _ Class Notes...
ย 
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptxRESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
ย 
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...
ย 
spot a liar (Haiqa 146).pptx Technical writhing and presentation skills
spot a liar (Haiqa 146).pptx Technical writhing and presentation skillsspot a liar (Haiqa 146).pptx Technical writhing and presentation skills
spot a liar (Haiqa 146).pptx Technical writhing and presentation skills
ย 
HYPERTENSION - SLIDE SHARE PRESENTATION.
HYPERTENSION - SLIDE SHARE PRESENTATION.HYPERTENSION - SLIDE SHARE PRESENTATION.
HYPERTENSION - SLIDE SHARE PRESENTATION.
ย 
CIS 4200-02 Group 1 Final Project Report (1).pdf
CIS 4200-02 Group 1 Final Project Report (1).pdfCIS 4200-02 Group 1 Final Project Report (1).pdf
CIS 4200-02 Group 1 Final Project Report (1).pdf
ย 
A Free 200-Page eBook ~ Brain and Mind Exercise.pptx
A Free 200-Page eBook ~ Brain and Mind Exercise.pptxA Free 200-Page eBook ~ Brain and Mind Exercise.pptx
A Free 200-Page eBook ~ Brain and Mind Exercise.pptx
ย 
Electric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger HuntElectric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger Hunt
ย 
220711130088 Sumi Basak Virtual University EPC 3.pptx
220711130088 Sumi Basak Virtual University EPC 3.pptx220711130088 Sumi Basak Virtual University EPC 3.pptx
220711130088 Sumi Basak Virtual University EPC 3.pptx
ย 
How to Fix [Errno 98] address already in use
How to Fix [Errno 98] address already in useHow to Fix [Errno 98] address already in use
How to Fix [Errno 98] address already in use
ย 
Oliver Asks for More by Charles Dickens (9)
Oliver Asks for More by Charles Dickens (9)Oliver Asks for More by Charles Dickens (9)
Oliver Asks for More by Charles Dickens (9)
ย 
skeleton System.pdf (skeleton system wow)
skeleton System.pdf (skeleton system wow)skeleton System.pdf (skeleton system wow)
skeleton System.pdf (skeleton system wow)
ย 
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...
ย 
Standardized tool for Intelligence test.
Standardized tool for Intelligence test.Standardized tool for Intelligence test.
Standardized tool for Intelligence test.
ย 
Skimbleshanks-The-Railway-Cat by T S Eliot
Skimbleshanks-The-Railway-Cat by T S EliotSkimbleshanks-The-Railway-Cat by T S Eliot
Skimbleshanks-The-Railway-Cat by T S Eliot
ย 
Temple of Asclepius in Thrace. Excavation results
Temple of Asclepius in Thrace. Excavation resultsTemple of Asclepius in Thrace. Excavation results
Temple of Asclepius in Thrace. Excavation results
ย 
REASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdf
REASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdfREASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdf
REASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdf
ย 
Accounting for Restricted Grants When and How To Record Properly
Accounting for Restricted Grants  When and How To Record ProperlyAccounting for Restricted Grants  When and How To Record Properly
Accounting for Restricted Grants When and How To Record Properly
ย 

Explain why it is a concern that people rely on relatively few species.pdf

  • 1. Explain why it is a concern that people rely on relatively few species of plant and animal for food and how this violates the principle of sustainability. Describe at least one specific example of how something could occur that would cause a problem. What can individuals do to shift to more sustainable energy use? What is the difference between net energy and net energy ratio?